The GP328 adaptor allows use of lower cost GP300 style 2 pin audio accessories on Motorola's multipin GP328/340/HT1250/MTX8250 etc. radios. When handing over radios from shift to shift, these versatile adaptors allow you to swap personal issue accessories efficiently. They also save on wear and tear on the radio's side accessory connector which can help reduce radio maintenance cost over the years.